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https://issues.apache.org/jira/browse/PDFBOX-4222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16477510#comment-16477510
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Tilman Hausherr commented on PDFBOX-4222:
-----------------------------------------
There's an error in the page labels number tree... the array should be [
number, dictionary, number, dictionary, number, dictionary ] but it is [
number, dictionary, number, dictionary, dictionary ].
{noformat}
/PageLabels << /Nums [ 4 << /S /D >> 52 << /St 49 /S /D >> << /St 49 /S /D >> ]
>>
{noformat}
> PDFMergerUtility: java.lang.ClassCastException:
> org.apache.pdfbox.cos.COSDictionary cannot be cast to
> org.apache.pdfbox.cos.COSNumber
> -------------------------------------------------------------------------------------------------------------------------------------
>
> Key: PDFBOX-4222
> URL: https://issues.apache.org/jira/browse/PDFBOX-4222
> Project: PDFBox
> Issue Type: Bug
> Components: Utilities
> Affects Versions: 2.0.9
> Environment: Ubuntu 14.04 and Windows 7
> Reporter: Eduard von Feek
> Priority: Major
>
> Given a problematic PDF, there can be ClassCastException when merging two
> PDFs, causing the merge to fail.
>
> Problematic example PDF: [https://bibliothek.wzb.eu/pdf/2001/ii01-303.pdf]
>
> Provoking command line:
> {code:java}
> java -jar pdfbox-app-2.0.9.jar PDFMerger ii01-303.pdf ii01-303.pdf
> out.pdf{code}
>
> Stacktrace:
> {code:java}
> Exception in thread "main" java.lang.ClassCastException:
> org.apache.pdfbox.cos.COSDictionary cannot be cast to
> org.apache.pdfbox.cos.COSNumber
> at
> org.apache.pdfbox.multipdf.PDFMergerUtility.appendDocument(PDFMergerUtility.java:504)
> at
> org.apache.pdfbox.multipdf.PDFMergerUtility.mergeDocuments(PDFMergerUtility.java:263)
> at org.apache.pdfbox.tools.PDFMerger.merge(PDFMerger.java:70)
> at org.apache.pdfbox.tools.PDFMerger.main(PDFMerger.java:49)
> at org.apache.pdfbox.tools.PDFBox.main(PDFBox.java:81){code}
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